Type-bar rest



C. B. CORCORAN TYPE BAR REST Filed July 21. 192g Patented Apr. 14, 1925.

I UNITED i 1 1,533,392 PATENT OFFICE.

oQRNE IUS 3. ooRCOR-AN, F YORK, N. Y., Assronon TO UNDERWOOD TYP W ITER G MBAN OF NE YO K. Yw, A C OR IO Q'I LAWAR TYlEE-BAR BEST;

Application filedJuly 21, 1922.

To all whom it may concern.

type-bars are arranged about a common printing point and move one at &ti3i11l*t0 the printing position. 1

These type-bars, especially in -frontstrike machines, are often closely arranged, so. that, in rapid operation, there is liability of clashing, due largelyto. thetact that the" type-bars may rebound from the basket ortype-rest', upon: returning to normal position, thus getting-into the path of a subsequentlyoperated type-bar. Cushions haveibeenprovided at the type-rest to. prevent such rebound. 3 V

An object of the inventionis a cushion, for the purposementioned,which shall function more effectively, be 0 t cheaperand more durable construction, and be less subject to deterioration by Wear or distortion, than cushions heretofore employed.

Another object of the invention-is an: int proved cushion, comprising a helix or helices, so set, and of such inelastic naturc, as to absorb the force of the return-strokes ot' the type-bars, and thereby eliminate rebound of the latter. A i'eature of the invention is the shaping or setting together of the helix or helices to provide a broad surface for receiving and distributing the impact of the typcbars; thus to absorb the force thereof without undue distortion or wear of the cushion at the points where the bars strike the same.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a view. in cross-sectional side elevation, through the platen, type-rest or basket, and type-segment of a front-strike typewriting machine, the type-bar, pivoted to the typesegmcnt, being shown in normal position upon the type-rest.

.Figure 2 is a front View of the type-rest or basket, hung from the top plate of the machine. v

Figure 3 is a top plan view of the typebar-rest or basket.

Serial No; 576,416.

Figure at is a top plan view of one endof the type-bar-cushion.

Figure 5 is a top plan view of one end of a modified form oftype bar cushion,

Figure 6 is a view, in cross section, of the cushion of Figure 4-.

Figure 7 is a view, in cross-section, of the cushion shown in Figure 5.

Figure S is a perspective view of the helical coil otthefFigure 5 cushion.

Figure 9 is a top plan view, partlyiin section, of a portion of the loops of the envcloped coils shown in Figures 2 and 4, in partial interlockment with each other. i

The machine illustrated is of the frontstrike variety. Type-bars 10, carrying types 11, lie horizontally in front of and below a platen 12,,and' are pivotally supported at their rear ends upon a Clll'VGtlflllClllIl'l-lOLl 13. mounted in a slotted segment 14:; the typebars being operated by horizontal pull-rods l4, and provided with the usual returning springs (not shown). Attheir forward ends. the type-bars rest in .abasket. The base of this basket is a segmental'bar 15, having cars 16, whereby the segmental bar may behung by screws 17 from the top plate 18 of the machine-frame, atthe front ofthe latter. Set within the concavity of the segmental bar is a cushion 19-, against which the ends of the type-bars strike on return from the platen, and on which the type-bars rest except when operated.

In the form of the invention shown in Figures 4- and 6, the cushion 19 comprises two helical coils 20 and 21 of wire; which may be soft iron, soft brass or other suitable substancc. The coils 20 and 21, preterably enclosed in canvas envelopes and 23, respectively, are laid alongside each other lengthwise of the segmental bar 15. The turns or loops of one of the coilsmay interlock to some extent with the turns or loops of the other coil; the thin, flexible character of the canvas, or other selected material -for the envelopes, if present, permitting of such interlockment. Thus laid alongside each other, the enclosed coils 20 and 21 are together enclosed in a single elongated envclope 24 of canvas or other material. which envelope is formed of a strip, folded laterally across the coils, and having its edges brought together, as at 25, to form a flange or lip, to receive pins 27. for securing the cushion to the segmental bar. 'Clips '25 may be employed to close the ends of the envelopes. The coils are so formed that adjacent loops or turns therein will rub on one another when the cushion isiflexed by a type- I The two coils 20 and 21, being laid one forward of the other on the segmental bar, constitute a cushion of sutficient breadth to receive, and to properly distribute, the forceof the return-blows of the typebars, without being unduly indented or disturbed by the bars. When the loops of one of the coils are set against-the loops of the other, or are partially interlocked therewith, the cushion has more stiffness or stability than otherwise, but is nevertheless sufficiently flexible to render the cushion wholly or nearly inelastic. A type-bar striking the cush on occasionsa disturbance of the relative positions of the loops of the coils, the loops moving on one another with a friction which causes the energy of the type-bar-blows to be absorbed by the cushion, and which opposes any elastic recovery of the cushion when so bent or indented by the type-bar. In other words, when the type-bars strike the cushion, the latter is slightly flexed; but, owing to the binding and friction of the loops oneup another in each coil, or, if the coils lie against each other, or are interlocked, of the loops of one coil upon the loops of the other, the cushion does not at once recover,

and the type-bar, instead of being thrown back. lies dead.

In the modificationshown in Figures 5, 7 a1id 8, the cushion, instead of comprising two coils set one in front of the other on the segmentalbar, comprises a single coil or helix 28 of flattened or elliptical cross-section. This coil is set in anienvelope or sheathing of canvas or other suitable mate rial, similar to the envelope 24L of Figures l and 6, and having a flange or lip 29, by means of which it is secured by the pins 26 to the segmental bar 15.

The coil 28 is of such size, or rather is of such breadth from front to rear, as to provide, as in the case of the Figures 4 and 6 'form of the invention, a wide seat for the type bars. There being but one coil shown in the Figures 5,7 and 8 modification of the invention, the friction and binding oi one loop upon another is necessarily of adjacent loops in the same coil. As in the form of the invention first described, so in the Figures 5, 7 and 8 form of the invention, the

cushion yields locally, or over a certain helices laid alongside and in partial interlockment with one another.

2. In a front-strike t-ypewriting machine, a platen, a rigid segmental bar hung from the frame forward of the platen, a cushion comprising a plurality of helices laid alongside and in partial interlockment with each other on the, segmental bar, and typeebars adapted to swing from the platen to'a position in which .theirbacks rest upon the several helices.

CORNELIUS B. GORCORAN.-

Witnesses CATHERINE A. NEWELL,

EDITH B. LIBBEY. 

